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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11e989198b9295fcb6718fe1ffb20b0eba25a09a2ab3dc13d505b8f5c17842f3' 
  AND token = 'OW/JRQs/4agcd/pvpTFGc1LHgeKOz8D9qsmwU6NpH38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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