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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50bf8430f140eba11968959d93e67b4c77587f3593035a9d5f12116ed4a12954' 
  AND token = 'ihC4zg91/9eKkgOjQPFu4lFHerne51bANZpHoQXz2+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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