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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd44291ff7be113ee6a82ca41b8ebfa52d5098b6df9d9a18334acfe280a92234b' 
  AND token = 'q5crJuKf+QGKc812aiuty8qfkqxYTDwfQ7eJRzCfpRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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