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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b8c27e382f9836d9a1c0ede91ff12d872d7d543ed31d67d17e249fb6e5924ae' 
  AND token = '4TT+yDariNjijLdqBZc+SqAOcb8TKiDZ8bFuDPJNn1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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