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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7699240549fa8742a23e0fd20bcb1468abdcc2494ad5b5b490c268ca848a7e2' 
  AND token = '2GBA2L3zW3cKJycyA51vg2B5Ust3cwP9bqWpVNliywE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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