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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85bebda0fb5504d14d04147ad67cefd8d4aa15ecfc31406fc59c6942c265acf2' 
  AND token = 'DxxJwO+Xlj4Nrw1r40bFuQeL2f7ZW9h+qLd2e7JkwDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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