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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2159c4c01f4f4cdde753cee897c5606b9b67ef159023d78564f19614972d8c' 
  AND token = '13rlIR46l61eHymQa/0sRKovu0M7yh7vdVqBH9FyzG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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