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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b2a9ee467346541927e7fd4b1afb54d7bc5fe8a66a251987573c458cd412e7a' 
  AND token = 'Rj6hS2mpwfLum8NHQbLH5zn+p7ffYZ+YnsOmd+iD2U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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