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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c432beb0564101bb48b7507d743d6ba345103d1ee0fe0890c98a6d53c4ee66' 
  AND token = 'wKJnuR9eNP2Zw9PK8zvZ6/4qvTdm4UU82IE4dqhD8fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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