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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ebf85698ad120134b8aca3e040171d269ba9b1b6a26cade77be2484a916e86a' 
  AND token = 'I95H4+e2Y3PrUzVRlX/84YzUm5GelQQ2WRgoMtt4P7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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