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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69e3f0f87661de9d6976fb3b9517008a7a974ed6f7529d7c85fd63fc0b7aa4f' 
  AND token = 'giXT03ZtXTgv09fOalZ6KoK0ClpsytTLfbpyMhCtX1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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