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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a8cae7e49901e4d99400deec0ec1d21b0fb2c11704a3a929b67e16539806af1' 
  AND token = 'ystYZLPcCz7jXPGAf5bBEeFwk4vAxMcu9rH8CC0YtYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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