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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb7cc32057ff5637407c1f9c35ad7e60efd4cfb7e44f0ad1d97cdc7d9a4228d0' 
  AND token = 'AlTRQpeLYRhenkJe+g5m7gkSzlsjQhlBNrr6pgum0+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00122

JSON explain

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