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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '652f6e65b7b0f1f3c9d39ff1ab413bb5f20e990a76727d7d15140476344802ba' 
  AND token = '3P1vpy+v6u9090lMhOIWVxDRD/rHdNgqihAJ2q0RrJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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