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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53e172b6aeb69b84f4e4eae9fb1912ff3996092b25b6cacd75c0dd6625f098fc' 
  AND token = 'uBnc+Q8WHA2TZqcL+jyMo6EYsC/SIXprZX8znTB1ST4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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