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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17f04a91c5fb9ad9a5d70871375095582db8f2e8e6d9427d03242c0e17bb6c25' 
  AND token = 'SYBHpu5ELAINaJqFcChmR2/N2tS0yZ8uSh3ADH58unY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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