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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ea5b5570a7c68ae8c5ae8594e747b2dd3ccd626ed357408163ceb84c96783cc' 
  AND token = 'FyCf5Bxuj6sUzg9KiPNaKp98x+V118aNO34ZQuc8Y18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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