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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef6d15d89efec0b0f9797c3c3f29c5c48e3fa2df4d2fe99bb44b9aef8fe5d26d' 
  AND token = 'ErzmGXapzxuIaj9NlNjuJzokkD0pA5wIf9A6QSpjW0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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