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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bfdb4edf14ea69f219bba35e476daf5f3f623006c561d39837db126bd559b11' 
  AND token = 'p2cieOBlLZ87yGstvoeR9xOqFcMi8/W/qBB5FmqZFoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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