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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4dec70dccb0926a3fb2b7d7e7387424d594ba6db17865beb13ddb367e089835' 
  AND token = '9BL6y5svgN/EgIm7SJWbe5EBXR9ugLO4Vcl+FG2Ig7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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