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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd43fb7d534d92f9ea4477e39836c8b794a681bc609a2cbe4ed8f034e56d577' 
  AND token = '3GgaDczk9UDCoS32/mSpwMe3scKiMnIo8nW/9FaGzZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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