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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54103b5643da179e373187f77c9260e5fcea65e42a66b37e282f385ce9c893dc' 
  AND token = 'bMQVBfUYl4LR2xKbWogx7jxB08FV3Y7CxcOKZPP3sbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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