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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6123ed2d23b7e8d61d7a2f4ee8505b0b87e9361798ec5c8182eb8926111c45d' 
  AND token = 'WzKxaUxOVxb8Ip/9YbCy7H/1/yRtA8jUVxU+hNsbfq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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