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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '594b81dc42af1c2aabb59c952238c5225409822d39bd296f26fa1b457e43f878' 
  AND token = 'sUMhhou+TyV9LL4XIkI2kY8xpFtcVQfblNR8Ch00RhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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