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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb2dfb0d287cabb803f27d420f17cea5b618822bfacebe6d768cce146258c22' 
  AND token = 'pjCihppLf1nck9Jsrp32hOvCyMjzbSeTy+ZrVG23FAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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