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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1f0d6dc40a4ab22eb647072d31557c1d698fcf33f7259b180d13167839b9de' 
  AND token = 'TJYOHX8cVM8kZFC3Cwn9lwxaDE0ab9vkoI2T8QPmAU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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