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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac3aadef2defa3e74d4c064936fd39dc9e0799b98b081fe7b30e8f351da6c0c' 
  AND token = '5g2ngpVPiRnTOeAe6sSWmLBjjOv4l6AYXB3238PLULA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}