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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd332af5d1a6b0efc0d50ceb1006212d747e1c00270ce68d656688f037f33c0f8' 
  AND token = '5V1AE7ah6YuP+4jKMV/wA8W4KazFqVtlXurMbaQ7mGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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