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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ab7f4f2f872c762acde3b04bf09fbca4e6396182a0466e18ea404c69e257bed' 
  AND token = 'FVwnMzzyAwvgvy4bXASsP6ipGCyxvNz7oC7MpGUS1Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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