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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02286ed912c8e14def656c8ba2543d07428607e8a3d892f515b7ccc99531b1e' 
  AND token = 'ufzw7xeswfBCDjMHak8MSiw3ZCLD+Hqo4dh1WY7ZLp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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