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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba471d6b650bb31f04d2af562d74af9fff01cc57051b74096be8dfcdabc36a6' 
  AND token = 'MbYMvkJo6i/zLutozwe3J7shOJ50ZH4QTkFrsfZvX1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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