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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f3aba7f2e8c1db3a982a4dbcb4483915105b9e3fd9f4fef1d83d89d465b2ff' 
  AND token = 'bf9wgT3pLZOyyaWxvowLwmQCmZ1bnWWzIAKs+IBrtGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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