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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17853a5521930da11dd9435eee12fab9a70061c641b28e3e2387f7d38487dcc7' 
  AND token = 'BuArWnEu1BmpeicOg4c7K/65XfhM6hALS66DSO9UhMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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