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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a75091b44fa396b16070a3f57dbc2c19dc8bb1b3ee3e200a4ac13999c5a34fb9' 
  AND token = 'EERp/2xHB9Xgzt1pbVZ0Ip7etBRIbEqgWziSb1HXhqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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