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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbacf79199a0c3cee4eae792e167cc049fc3d5e803f10947b032deb5527cf890' 
  AND token = '/np2zUBpe7nXB9uFd6ojKBx6G7Q68a85RjfVbxhglh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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