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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '151011885f419a35e9b485cd7c13a3f8f881d783819316e76f5fa5e776757167' 
  AND token = 'K0y/vPDZc+VAYAXKIH0nUx5gZvnjCBGc+p85nCXyVj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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