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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05f6563c3e2d903ac9741e961de01c40afe71129ab4869735398262d4ee23a7c' 
  AND token = 'kXf9cYdbIM7yjX2iSuyI4o5lghHkCIXgCvNGnOa4Xgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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