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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cf8943deea438c3153ae7b58c6496be1ebaa7bbf42ee79e04b14354c308282c' 
  AND token = 'Re5Iyr/BKZ19G2//kBE9NUQPncUbPnwcgl4QrEl6a78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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