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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d6fc8f33b2b2ba9d4e0ad766e048fde7b9f1a10d1fce9cd6eb405903129953' 
  AND token = 'cqZFJYNzRCBR0+d2ojCeZmeTTfOi8t5lEe5yDpdeAFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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