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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa88e987fea76025d4305662c12ce47164cde934083db2f2b982db0ce9b86d8e' 
  AND token = '700KFKSYKjNJolk08HBd0PfGjESC74+ciPb1TFCVtd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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