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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ea6336dbbcc5c8e3e62da45366f7cb174a89ce3b526b378ca9fe0b4f099f56c' 
  AND token = 'fCS+vNPeipCpoq9cyBuaZQ4turY6iFd82eIQnIGK7og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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