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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd111bb67ee23b0894e8f11a5c0c8a3cbebfa4b781a20fc0f2c6fd79d0a671c58' 
  AND token = 'NhC3zBwvwauBAoJAhRNaLy0feBY6ULFgxsmA+Ukk5J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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