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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc91267560df3175f629f25aec08c4e39d4724162ebe76a3dc4b2719a4f63ea7' 
  AND token = '98dTzLsULiS0XIy+g+Aso1wn9XOMiNT1OrFK1blWPcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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