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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ae3245a55b11ce49e1aeef7edfdad0b20b42cf37faf7392d631f1f5e161cfc' 
  AND token = 'jSq+Z/4QOU7cNJS5UekeK6NKAV9leODiHNgvV9F2IjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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