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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4736da2a77d3023b9c2f7b34b8a770f1eb841c69e4c8570e1ec66b95f2c2d9b' 
  AND token = 'rYAWgF43HeFsupP4ifLZWJUCFjtsvXRsSt58K2vqtHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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