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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06d9611954450e1fdca919775ea78441b323b4496ef18c51d0ba9bb1546bffac' 
  AND token = 'uF9R494QleQj4cAxLG5JeZTKTIcS20vnxqt8z4n9cLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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