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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020dfa06f9b2d16616825685e0e160df3b29b7293ecfe69a37aec7dd6f1dbb95' 
  AND token = 'Ipv2WRQAiRJLXU3h1XuqGmJ7ap6JjRZXuPqSIZhqd24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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