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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a91252a3000891994b38b06ed997eb6b814c7369723cdbbb766d177de420f84' 
  AND token = 'rC754hdF3RLQAiznK8sJVL4duwbbBt3WdbdrXPsZpto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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