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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c0c4e9fc30c5ea604de656c28be48340547f67b048e58cbe65b1f9566fd988' 
  AND token = 'VIf2esXeIGbkL4bFID4opfhiCOW7Y9fPMsp71jAg8t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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