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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd31044614a65c3672c22921a7a6040aa546140e5a6c2e7f323e8c707248fbcd0' 
  AND token = 'L5DpECep2QnwQ09akXJfuANKIMNvBDtxLdOVf32nTW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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