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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'badc004a2f5921a2f00b773aff1a0a186d24a5b7fe05b4643b255bbd3634117d' 
  AND token = 'lqD0+SH4pc31Mo3iwqgJT3+0JRd93jGAWWnse+WGwic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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