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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71af5ba1f7be2943adefdbf41d00b2c4080e0315853d0d1820e9278f93d1a94f' 
  AND token = '6RkpdWVwbQTIITBolvqN3fgwozuxXzQB9GC6HrQ8IwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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