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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d8be5cee02326c6e11c6f624b341cd4547a32008ab03a20bac55f5c3d4f31d6' 
  AND token = 'c0lewu1CKiki3barKBs8deCzPKHfM78ilPqdbsnq/CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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