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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d306caf92edcef6aff6428f9e5d29a68181d22743710d704637b14b96a901ef' 
  AND token = '7DxV592ZQwZM9NHFS8T2n2g2FYyen/T/s3TJ8ybxsCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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