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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860365679d7cbc481a4a64af801025d1a9d150434b280fc85f28577dd798ff6c' 
  AND token = 'PV+rZpoMuBS4Mb+WJ44pDcuBEsu0gMnXyA2+oTKXyFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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