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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629b311963e022336aacfdecf1d2582af1f7b19f493795d9ad19f69ec479311a' 
  AND token = 'tG6HdYT8Gp0/c7siH3cquvcEL45REh53sB6lJhkteyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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