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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19c3ee7f8992722a23e92dd9182092511d29dd40a4edfba2225677499306ca17' 
  AND token = 'hNH16NFk0Gc0ToH9jxGZEcZjGNHyoB7/hso8quzlanY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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