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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b835a0b60cd1598cf4ad1ffaf02fa6b93ac29dbf51476371147dba722118663' 
  AND token = '6bnZRg3EGD/wMgZZQn6FfnwU924ZNa/xT8npJzhW3zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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