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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dcd66060066bd2b6a0a242bc6a60394daad6b481b7f9ab1929929551430bafe' 
  AND token = 'nqg9R/9pPSRzCPFsMrN1CqPPXeeC0vy+NkFc4y+06qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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