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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7f2941d2ed222cf8e99d5d499e2d2149fe3a64f16efa70509c465183969db0' 
  AND token = 'KlaulnpdMgQ/g2tQ6cZqlrbFveUd81Ifz8mHoXSkoeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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