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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad48cfb4d8d3e5145e9ca1f336035b374ce7fce8751fd352db8a3e05abf749d' 
  AND token = '4OaYejUGYgqkYjknXF9alHwvexO7XaorZ23ti2A1EZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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