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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd39a9001a8b728dd2075ebb294ef03ed572f4ac4440d9cafaf594d312f5492' 
  AND token = 'Zb86hg0LvTH65XvBTdtxc+hlenk4HdDhXYlH4Qakdcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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