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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93a81b296226cace084ca218cf15d30fd573cb399a0046bc856f2d62e480c18' 
  AND token = 'W2vUWZ8Y0XFO1U+ERr9nPkyoFxXFljYXeyoAYGf7uh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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