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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2823e0201c7b68a3fa88e8bfb5f42ef52cf66cf5b73f6d5873a063fefbcfbfe2' 
  AND token = 'nrfOjweLOQXMK7NoaqKgwJnSw/gnpudyRk9Jk0fM3Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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