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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83bc12b8f24c6810aef9acefe8c3bf008f870adc9a683198ceaa8ebbe81d6cdb' 
  AND token = 'HpOhS6kmgaYsBVYynAXC1o0avFDXsfVtaX3s6demUWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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