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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b4f720afcab4a0fb5ad3ece20ac9243aee7f911c5f0236853e13ab15df118ea' 
  AND token = '0KOh+di3/zxzbEv9ZHBzRGtSci4dm8oGay1BvYPyUXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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