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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3dc7d2a827d423f7f3865f85a16f69a030736301b6a46c45b187792d3eec2e3' 
  AND token = '0CGbw7QH+UHI1AR3sC5QF24CcYB+BOhtoiz2Bqiw2ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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