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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fe158ce102c838603187fd380b7399e43fd61ef387c53790df4b38a974700c0' 
  AND token = 'B9ALuo3aL3O86ogtkQU180euz2QwzuOspO1DRX4598Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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