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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b9944d0c4c3319da364dead8fedc1994b2b3460322d2425cf83f12b6b5ddb3' 
  AND token = 'TKIBwapuayhreObfLosxSuRRMVCP6uwked4nFOyRQrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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