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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3050dd4a0a8c90621aa1786b8715f03ce75328103b7b6756e726838130e02428' 
  AND token = 'a9cTRKr6wObXh3FB+pG7lOmR9GTRqM4xaY8cqxKHrSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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